Product Overview
The Cisco QSFP-40G-SR4 is a high-performance 40 Gigabit Ethernet QSFP+ optical transceiver designed for short-reach data communication over multimode fiber (MMF). It is widely deployed in enterprise networks, cloud data centers, and high-speed switching environments where reliable and cost-effective 40G connectivity is required.
Operating at an 850nm wavelength, this module uses VCSEL laser technology and an MPO/MTP-12 interface to deliver stable and efficient parallel optical transmission. It supports distances of up to 100 meters on OM3 fiber and 150 meters on OM4 fiber, making it ideal for high-density short-range interconnects.
Fully compliant with IEEE 802.3ba 40GBASE-SR4 and QSFP+ MSA standards, this module ensures seamless interoperability with Cisco networking equipment such as Nexus, Catalyst, and ASR series switches.
Key Features
- 40Gbps high-speed data transmission
- 850nm VCSEL-based optical technology
- MPO/MTP-12 multimode fiber interface
- Up to 100m (OM3) / 150m (OM4) transmission distance
- 4×10G parallel optical channels (breakout supported)
- Hot-pluggable QSFP+ form factor
- Low power consumption (<1.5W typical)
- Digital Optical Monitoring (DOM/DDM) support
- Fully compliant with IEEE 802.3ba & QSFP+ MSA
- Designed for Cisco-compatible switches
Quick Specifications
| Item |
Description |
| Product Model |
QSFP-40G-SR4 |
| Form Factor |
QSFP+ |
| Data Rate |
40Gbps |
| Wavelength |
850nm |
| Fiber Type |
Multimode Fiber (MMF) |
| Connector |
MPO/MTP-12 |
| Max Distance |
100m (OM3) / 150m (OM4) |
| Optical Technology |
VCSEL |
| Transmission Mode |
4×10G Parallel Optics |
| Power Consumption |
<1.5W |
| Temperature Range |
0°C to 70°C |
| Monitoring |
DOM/DDM Supported |
|
Standards
|
IEEE 802.3ba, QSFP+ MSA |
Applications
The Cisco QSFP-40G-SR4 is ideal for:
- Data center spine-leaf architectures
- High-performance enterprise networks
- Cloud computing infrastructure
- 40G switch-to-switch interconnects
- Storage area networks (SAN)
- High-density rack server connectivity
- 40G to 4×10G breakout configurations
Advantages of Cisco QSFP-40G-SR4
High-Speed and Stable Performance
Delivers consistent 40Gbps throughput for demanding enterprise and data center applications.
Cost-Effective 40G Upgrade Solution
Provides an economical upgrade path from 10G to 40G using existing multimode fiber infrastructure.
Cisco-Compatible Reliability
Designed for seamless compatibility with Cisco Nexus, Catalyst, and ASR platforms, ensuring stable plug-and-play deployment.
Flexible Network Design
Supports 4×10G breakout connections, enabling flexible network scaling and improved port utilization.
Comparison: QSFP-40G-SR4 vs QSFP-40G-SR-BD
| Feature |
QSFP-40G-SR4 |
QSFP-40G-SR-BD |
| Connector |
MPO/MTP |
LC Duplex |
| Fiber Type |
MMF (8-core) |
MMF (2-core) |
| Distance |
100m / 150m |
100m / 150m |
| Breakout Support |
Yes |
No |
| Deployment Type |
High-density data centers |
Legacy LC infrastructure |
| Cabling Complexity |
Medium |
Low |
FAQ
1. What fiber cable does QSFP-40G-SR4 use?
It uses multimode fiber (MMF) with an MPO/MTP-12 connector, typically OM3 or OM4 fiber.
2. What is the maximum transmission distance?
- 100 meters on OM3 fiber
- 150 meters on OM4 fiber
3. Is this module compatible with Cisco switches?
Yes, it is compatible with Cisco Nexus, Catalyst, and ASR series switches.
4. Does it support 40G to 4×10G breakout?
Yes, it supports breakout to four independent 10G channels using MPO breakout cables.
5. What is DOM/DDM monitoring?
DOM (Digital Optical Monitoring) allows real-time monitoring of optical power, temperature, voltage, and laser bias current.
6. What is the difference between SR4 and SR-BD?
SR4 uses MPO fiber and supports 4×10G parallel transmission, while SR-BD uses LC duplex fiber and is designed for legacy cabling systems.
7. Is it hot-swappable?
Yes, the QSFP-40G-SR4 is fully hot-pluggable for easy installation and replacement.
Quality Assurance & Support
- 100% tested before shipment
- Full compatibility testing with Cisco platforms
- Strict quality control for optical performance
- Professional technical support team
- Fast global shipping
- Warranty and replacement service available
